Function definiens 

pub fn definiens<'a, MS: STeXModuleStore>(
    definiens: Macro<'a, LSPLineCol>,
    p: &mut LaTeXParser<'a, LSPLineCol, STeXToken<LSPLineCol>, STeXParseState<'a, LSPLineCol, MS>>,
) -> MacroResult<'a, LSPLineCol, STeXToken<LSPLineCol>>

Panics